Awk: Hack the planet['s text]! (Presentation) - 2023 Update

[@drf9479]

0:00 -- Intro 0:39 -- Outline 1:34 -- What is AWK? 3:25-- Why learn AWK? 4:27 -- History AWK 6:46 -- Super simple AWK programs 8:15 -- "Hello World" in AWK 8:38 -- Running AWK program 10:49 -- AWK structure 15:04 -- AWK Patterns overview 16:09 -- Summary of Patterns 19:42 -- Operators 20:43 -- String-matching patterns 22:28 -- Escape sequences 22:48 -- Range Patterns 24:12 -- Pattern summary table 25:42 -- AWK Actions overview 27:34 -- AWK Statements 29:00 -- simplest AWK programs 32:50 -- Built-in Variables (✨Magic variables) -- Dive a Little Deeper (functions, pips) -- Example Programs

[@tristansnow]

You are a gifted teacher. Thank you so much for taking the time to make this update. Subscribed!

[@varshneydevansh]

I have ADHD-c and within first 2 minutes you caught my attention now I can say I will watch this completely. Thanks, you're a great teacher.

[@pmarreck]

what does the hyphen-c stand for?

[@AmedeoZitti]

Love the reference to 1995 Hackers :D

[@gabrielginsberg5715]

Thank you so much, I honestly felt like I was slamming my face into a brick wall trying to learn awk. This video took me from not understanding it at its core to feeling like I fully grasped it at a relatively in depth level. I truly appreciate you taking the time to record and upload this.

[@amorsmor8528]

you made awk very easy for me to understand thanks for that great video

[@Amon-01ja]

Great teacher, thank you so much for this informative video!

[@EdDrain]

I am going to recommend this video on Exercism! Great video!

[@test99947]

you really have to be a hero to make an hour long talk about awk. thanks man

[@gatty.]

Really enjoying your awesome video! And you have an easy to listen to voice! Great tone, great enthusiasm. I'm learning a lot from this! Just a slight correction for 43:50 ish, with ++ and --. You mentioned 'after the fact' twice. Just for those listening, when it's presented before, it'll update and use the updated value (in case of print, it'll print the update). Where as, postfix it'll print then update. Correct? Pretty sure.

[@brunoromerogonzalez9026]

Thank you so much!!!

[@jasnarmstrng]

Superb intro!

[@Brewbug]

Especially the dad joke at 0:28 😅

[@Brewbug]

Especially the dad joke at 0:28 😅

[@pewolo]

This video was all I needed to master AWK!

[@lukurra]

great video, I liked it! a little criticism - audio level is quite low. youtube ads blast my ears off here. increasing levels and compressing would render it more comfortable.

[@odseverus]

This is great! Thanks for sharing! Greetings from 🇧🇷

[@tablett8351]

Wow, realy great! Thank you and your coworker for this good video.

[@Hannibal21623]

Thank you

[@philtoa334]

Very good.

[@gitgosc7075]

great!

[@divest6527]

Thank you for posting this, I've been "seeing" awk around for many many years but never tried to learn it from first principles. This video piqued my interest :)

[@alurma]

Thanks

[@Desi-qw9fc]

Where did you get the reference tables, like at 50:30?

[@freedom_ben]

Those came from the Aho/Kernighan/Weinberger book "The Awk Programming Language"! The whole book is on the internet archive here if you'd like it: ia803404.us.archive.org/0/items/pdfy-MgN0H1joIoDVoIC7/The_AWK_Programming_Language.pdf

[@artfol2]

good talk, please use mouse pointer to point where you at in the slide.

[@davidh.4944]

I just posted this on the first version of this video, before I discovered this updated one existed. But the point is the same, so I'm repeating it here. The "{$1=$1}1" command at the end doesn't just remove initial whitespace. By default awk removes _all_ of the whitespace between and around _every_ field, while the print command only re-inserts a single space between fields. So it doesn't just remove initial whitespace, it also removes trailing whitespace, and collapses all intra-string whitespace into single spaces. in other words, say goodbye to all of your tabs and other formatting. To definitively remove just the initial whitespace, you should use the sub (or gsub) substitution function and regex match it (they operate on $0 by default). awk "{ sub( /^\s*/ , "" ) }1" Frankly, in this case I think sed is a better choice: sed 's/^[ \t]*//'

[@freedom_ben]

Thanks David, you're absolutely right! That's super helpful.

[@pajeetsingh]

The longer the tutorial the better it is.

[@ChrisCox-wv7oo]

When you explained prefix postfix, you said it would be evaluated after the fact in both cases. Prefix : Inc/Decr before the variables value is used in the expression Postfix : Inc/Decr after the variable value is used in the expression a=0 print ++a // 1 will be printed a=0 print a++ // 0 will be printed In both cases, the value of a will be 1 after the print is performed.

[@freedom_ben]

Thanks!

[@r.rousset]

Thanks, for the update. Hopefully this will make my life less (AWK)ward.

[@danielbrockman7402]

awkwardly ordered slides awk

[@grijjly6091]

garbage

[@riebeck1986]

Thank you so much !!